|Breeder||Marylou Whitney Stables|
|Owner||Marylou Whitney Stables|
Triple Crown race wins:
Belmont Stakes (2004)
|NTRA "Moment of the Year" (2004)|
|Last updated on June 18, 2007|
Owned and bred by Marylou Whitney of Whitney family racing fame, Birdstone was sired by Grindstone, winner of the 1996 Kentucky Derby, who in turn was sired by Unbridled, who won the 1990 Kentucky Derby. Unbridled was in turn sired by Fappiano, a son of Mr. Prospector, the tail-male ancestor of the vast majority of winners of Triple Crown races in recent years (22 out of the 24 races 1998-2005).
Bird Town would later go on to produce graded stakes winner Bird Song (by Unbridled's Song).
Beginning his sophomore season, Birdstone won an allowance and finished fifth in the Lane's End Stakes.
He was not a factor in the first two Triple Crown races (finishing eighth in the Kentucky Derby and skipping the Preakness Stakes) and was a 36-1 longshot when he upset the overwhelmingly favored Smarty Jones, taking the lead in the final furlong (201 m) in the fastest Belmont Stakes since the advent of modern electronic timing (2002 was the first year times were kept to hundredths).
Birdstone's victory represented the first in the Belmont for trainer Nick Zito, whose horses had finished second in that classic five times. In the winner's circle after the Belmont Stakes, his owners apologized to the connections of Smarty Jones for winning, as did jockey Edgar Prado.
The next major race for Birdstone was the Travers Stakes, which he won being the fourth betting choice at 5-1. He was Zito's first Travers champion.
Retirement and Stud Career
From his first crop of foals to race, Birdstone sired Mine That Bird, who had several wins as a two-year-old gelding before winning the 2009 Kentucky Derby as a three-year-old. Another of Birdstone's top runners was Summer Bird, who upset Mine That Bird in the 2009 Belmont Stakes (later winning the Jockey Club Gold Cup). His first crop also included Birdrun, who set the Belmont track record at a mile and a sixteenth .
Birdstone was one of the top ten ranked freshman sires of 2008 with 11 winners out of 22 starters and stood for $10,000 for the remainder of the 2009 season, despite his first-crop success. His 2010 stud fee was posted as $30,000 but by 2017 it had fallen to $5,000.  Birdstone has sired 30 black-type runners, 19 stakes winners, 8 graded stakes winners, and has amassed progeny earnings over $21 million.
Birdstone's most notable progeny includes:
- Summer Bird: Won Belmont Stakes, Travers Stakes, Jockey Club Gold Cup, 2009 Eclipse Champion 3 Year Old Colt.
- Mine That Bird: Won Kentucky Derby, Grey Stakes, 2008 Canadian Champion Juvenile Male.
- Noble Bird: Won Stephen Foster Handicap, Pimlico Special, Fayette Stakes.
- Birdrun: Won Brooklyn Handicap.
- Blue Tone: Won San Gabriel Stakes.
- Thank You Marylou: Won Dogwood Stakes, multiple graded stakes placed. Breeders' Cup placed.
- Florida Won: Won Ontario Derby and Seagram Cup Stakes.
- Swipe: Won Juvenile Championship Stakes, multiple graded stakes placed. Breeders' Cup Placed.